1, 2, 3, 5-tetrahydro-4, 1-benzoxazepines and 3, 5-dehydro-4, 1-benzoxazepin-2-(1h)-ones



United States Patent 3,346,565 1,2,3,5 TETRAHYDRO 4,1 BENZOXAZEPINES AND 3,5 DEHYDRO 4,1 BENZOXAZEPIN- 2-(1H)-0NES Emilio Testa, Vacallo, Tessin, Switzerland, and Luigi Fontanella, Milan, Italy, assignors to Lepetit S.p.A., Milan, Italy No Drawing. Filed May 21, 1964, Ser. No. 369,290 Claims priority, application Great Britain, May 22, 1963, 20,442/ 63 15 Claims. (Cl. 260-2393) This invention is concerned with new compounds having sedative, tranquillizing and hypnotic activity. The compounds with which the invention is concerned are 3,5- dihydro-4,1-benzoxazepine derivatives of the formula R" (I) wherein R is H or halogen; R represents alkyl, aralkyl, acyl and the group RIIII in which n is an integer from 1' to and R and R"" are the same or different and represent H, alkyl, or together form an heterocyclic optionally substituted ring; 'R represents H, alkyl, aryl, aralkyl and X represents 0 or H The process for preparing the new compounds depends on the nature of the group R, and consists in introducing by conventional methods said substituent on the compound wherein R' and R"" have the above significances, the compounds are prepared by reacting II with the appropriate halide in an alkaline medium; when R is acyl the compounds are prepared by reacting II with a functional derivative of the selected acid.

7 ice The following non-limitative examples illustrates the invention.

EXAMPLE 1 I-methyI-S-phenyl 3,5 dihydro 4,1 benzoxazepin-Z- (1H)-0ne(1) To 50 m1. of liquid NH in a 250 ml. flask 250 mg. of sodium are added followed by a crystal of ferric nitrate. The mixture is stirred for 60 minutes keeping the temperature at 40 C., then 2.39 g. of 5-phenyl-3,5-dihydro- 4,l-benzoxazepin-2(1H)-one (prepared as described in our above-mentioned copending application Ser. No. 369,317) are added in small portions. Stirring is continued at -40 C. for 15 minutes, and 1.76 g. of CH I dissolved in anhydrous ethyl ether are added. After one hour of additional stirring at -40 C., NH is allowed to evaporate and 200 ml. of ethyl ether are added. The mixture is refluxed for 1.5 hours, then filtered. Petroleum ether is added and the obtained 1.5 g. of crude product are recrystallized from ethyl ether. Yield 1.2 g. of I, M.P. 110- 111 C.

EXAMPLE 2 1-acetyl-5-phenyl 1,2,3,5 tetrahydr0-4,1-benz0xazepine M.P. 149-150 C.

7 EXAMPLE 3 1-pr0pi0'nyl-5-phenyl 1,2,3,5 tetrahydr0-4,1-benz0-xazepine (III) Prepared according to the process of the preceding example from 3 g. of 5-phenyl-l,2,3,5-tetrahydro-4,l-benzoxazepine and propionic anhydride. Yield 3.3 g., M.P. 148-150 c.

' EXAMPLE 4 1-phenylcarbamyl-5-phenyl 1,2,3,5 tetrahydr0-4,1-benzoaxepine (IV) (a) A solution of 500 mg. of S-phenyl-1,2,3,5-tetrahydro-4,l-benzoxazepine in 10 ml. of ethyl ether are treated with 0.5 ml. of phenylisocyanate and refluxed for 15 minutes. On cooling a crystalline product separates out and is recrystallized from ethyl ether. Yield 0.650 mg., M.P. 188-189 C.

(b) To a solution of 5.3 g. of phosgene in ml. of anhydrous toluene, cooled to 5 C., a solution of 2 g. of 5-phenyl-1,2,3,5-tetrahydro-4,l-benzoxazepine in 20 ml. of toluene is added. The mixture is stirred four hours at room temperature, 1 hour at 50 C., and then concentrated to dryness in vacuo to give an oil which becomes solid on cooling; yield 2.6 g., M.P. 134-136 C. One gram of this compound dissolved in 10 ml. of anhydrous toluene is treated with 2 ml. of aniline and refluxed for 30 minutes. The solution is cooled, the excess aniline is extracted 3 with aqueous HCl, the toluene solution is dried over Na SO, and concentrated to dryness in vacuo. The residue is recrystallized from ethyl ether giving IV, M.P. 188-189 C.

EXAMPLE 5 1-nitr0s0-5-phenyl 1,2,3,5 tetrahydro-4,1-benzxazepine (V) To a solution of 10 g. of S-phenyl-l,2,3,5-tetrahydro- 4,1-benzoxazepine in 150 ml. of 80% acetic acid 4 g. of NaNO are added portionwise under stirring, keeping the temperature at C. The solution is heated to 90 C. and stirring is continued at this temperature for 60 minutes. Then it is cooled, extracted with benzene, washed with water and with 'NaHCO then again with water,

EXAMPLES -15 The following compounds-are prepared following substantially the procedure described in the preceding examples:

We claim:

1. A compound of the class consisting of 3,5-dihydro- 4,1-benzoxazepines of the formula:

R R R X 1v .P., B.P.,

H..-" OOCHQ H H: 100-105/06 oo-o1 H n, 127-129 EL... 0001 C1311} Hg 144-146 H (lo-Q01 H 0 110-112 H-.--. (oH,)3 NC -om H 0 190195/0.6

H- CH2CH2-N(C2H5)z H O 160l70/l.5

evaporated to dryness and the oily residue is crystallized X from petroleum ether. Yield 9.1 g. of V, M.P. 88-89 C. l I;

EXAMPLE 6 1 -diethylam in0ethyl-5-phenyl 7 chl0r0-3,5-dihydro-4,1- R

benzoxazepin-Z (1H)-one (VI) A mixture of 27 g. of 5-phenyl-7-chloro-3,S-dihydrol 4,1-benzoxazepin-2 (1H)-one, and 3.9 g. of NaNH in 350 ml. of anhydrous dioxane, is refluxed for one hour, then it is cooled to 40 C. and 13.6 g. of l-chloro-Z-diethylaminoethane are added. The mixture is refluxed 15 hours, then h i R i a member f h class i ti f hydrogen itis cooled, filtered and the solution evaporated to dryness. The residue is taken up with water, dissolved with 10% HCl, washed with diethyl ether, made alkaline and extracted with diethyl ether. The organic layer is washed with water, treated with charcoal and dried over Na SO The solvent is evaporated and the residue crystallized from petroleum ether; yield 2.6 g. of VI, M.P. -80" C.

EXAMPLE 7 1-piperiain0ethyl-5-phenyl 7 chloro 3,5 dihydr0-4,1- benzoxazepin-Z (1 H -0ne (VII Prepared. according to the process of the preceding example from 5.5 g. of 5-phenyl-7-chloro-3,5-dihydr0-4,1- benzoxazepin-'2(1H)-one and 3.3 g. of N-(beta-chloroethyl')-piperidine. Yield 4.3 g., M.P. 247 C.

EXAMPLE 8 1-('y-dimethylaminopropyl) 5 phenyl-7-chloro-3,5-dihydro-4,1-benz0xa2epin-2 (1H) -one (VIII') and halogen, R' is a member of the class consisting of acetyl, propionyl, phenylcarbamyll, chlorobenzoyl, chlorocarbonyl and nitroso groups and a group of the formula wherein n is an integer from 1 to 5, and B is a member of the class consisting of dimethylamino, diethylamino, l-piperidino, and 4-methyl-l-piperazino groups, X is a member of the class consisting of O and H and R" is a member of the class consisting of hydrogen and the phenyl group.

2. 1 acetyl 5 phenyl 1,2,3,5 tetrahydro 4,1- benzoxazepine.

3. 1 propionyl 5 phenyl 1,2,3,5 tetrahydro 4,1- benzoxazepine.

4. 1 phenylcarbamyll 5 phenyl 1,2,3,5 tetrahydro- 4,1-benzoxazepine.

5. l-acetyl-1,2,3,5-tetrahydro-4,l-benzoxazepine.

6. 1 p chlorobenzoyl 1,2,3,5 tetrahydro 4,1- benzoxazepine.

7. 1 nitroso 5 phenyl 1,2,3,5 tetrahydro 4,1- benzoxazepine.

8. 1 p chlorobenzoyl 3,5 dihydro 4,1 benzoxazepin-2( 1H) -one.

9. 1 chloroformyl 5 phenyl 1,2,3,5 tetrahydro- 4, 1-b enzoxazepine.

10. 1 dimethylaminopropyl 5 phenyl 7 chloro- 3,5 -dihydro-4, l-benzoxazepin-Z 1H) -one.

11. 1 piperidinoethyl 5 phenyl 7 chloro 3,5- dihydro-4,1-benzoXazepin-2( 1H) -one.

12. 1 diethynlaminoethyl 5 phenyl 7 chloro 3,5- dihydro-4,1-benzoXazepin-2( 1H) -one.

13. 1 1 [3 (4' methyl 1' piperazinyl)]- propyl} 5 phenyl 7 chloro 3,5 dihydro 4,1- benzoXazepin-2( 1H) -one.

14. 1 1 [3 (4 methyl 1' piperazinyl)]- propyl}-3,5-dihydro-4,1-benzoxazepin-2(1H)-one.

15. 1 diethylaminoethyl 3,5 dihydro 4,1 benzoxazepin-2( 1H -one.

References Cited UNITED STATES PATENTS 3,122,554 2/1964 POOS 260239.3 3,155,649 11/1964 Krapcho et a1 260239.3

OTHER REFERENCES HENRY R. JILES, Primary Examiner.

ALEX MAZEL, Examiner.

15 J. W. ADAMS, Assistant Examiner. 

1. A COMPOUND OF THE CLASS CONSISTING OF 3,5-DIHYDRO4,1-BENZOXAZEPINES OF THE FORMULA: 